<html>
  <body>
    <h1>Prueba 1</h1>
    <form action="php/crea_usuarios.php" method="POST">
      Login(nick): <input type="text" name="usuario"><br>
      Password: <input type="password" name="clave1"><br>
      Repite Password: <input type="password" name="clave2"><br>
      E-mail: <input type="text" name="email"><br>
      <input type="submit" name="Crear">
      <input name="Volver" type="button" onClick="location = 'index.html'" value="Volver" id="Volver">
    </form>
  </body>
</html>